Define what is implied by severe two-stage locking (severe 2PL). [4 marks] (c) Assume that notwithstanding customary Read and Write activities a DBMS upholds addition and decrement activities: Inc and Dec (both are accepted to perform blind composes). Think about the accompanying two exchanges. T1 : [Inc(A), Dec(B), Read(C)] T2 : [Inc(B), Dec(A), Read(C)] (I) By thinking about a few potential timetables of the above exchanges, portray cautiously the simultaneousness allowed by severe 2PL utilizing recently shared/read and select/compose locks. [3 marks] (ii) Detail a method for acquiring interleaving while as yet keeping up with severe 2PL. [7 marks] SECTION C 9 Logic and Proof (a) Define the ideas of a genuine sequent, a legitimate sequent and an essential sequent. You might take the ideas of valid and legitimate formul as crude. [3 marks] (b) Gentzen asserted that his evidence frameworks performed normal consistent thinking. Consider the accompanying sequent analytics rules: A, ? ? ? B, ? ? ? A ? B, ? ? ? A, ? ? ? ?x A, ? ? ? State the second rule's stipulation and make sense of the instincts behind each standard. [5 marks] (c) Choose one of these guidelines and give a thorough contention for its adequacy, utilizing the idea of a substantial sequent. [6 marks] (d) Precisely characterize the idea of the Most General Unifier (MGU) of two terms, giving models. [6 marks]What values do sep[1,2,3,4,5,6,7,8] and sep[1,2,3,4,5,6,7] yield? [4 marks] Deduce the ML sort of consolidation and make sense of why the oversight of ': int list' would prompt a blunder [2 marks] Give a ML meaning of the standard library work map. [2 marks] Describe what the capacity s does and make sense of why it works. [8 marks] 3 [TURN OVER CST.94.1.4 6 The accompanying ML statement presents an information type that can be utilized to address a possibly endless course of action of cells at positions with whole number directions in the primary quadrant of the x ? y plane: datatype A = Z | Cell of int ref * A ref * A ref; Each cell contains a whole number worth and pointers to the cells promptly to one side or more itself. These three parts are variable so the plan of the phones and the numbers they contain can change during use. The constructor Z can be utilized in A ref to permit a group to have a limit as opposed to going on through unbounded chains of cells. Characterize a capacity mkrow(n) of type int->A that will return a column of length n + 1 cells initialised with zeros. For example: mkrow(1) = Cell(ref 0, ref(Cell(ref 0, ref Z, ref Z)), ref Z) [5 marks] .

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Suppose we create a computer screen out of black/white pixels. Each row of the screen is controlled by a 4-bit number. For example, here we display a letter A. 0110 1001 1111 ← 1001 1001 a) b) Give the hexadecimal digits to display the letter C. (Since you choose the "font", show your work!) What letter is displayed by entering F22AE (leftmost digit is top row)? Suppose we create a computer screen out of black/white pixels. Each row of the screen is controlled by a 4-bit number. For example, here we display a letter A. 0110 1001 1111 ← 1001 1001 a) b) Give the hexadecimal digits to display the letter C. (Since you choose the "font", show your work!) What letter is displayed by entering F22AE (leftmost digit is top row)? Suppose we create a computer screen out of black/white pixels. Each row of the screen is controlled by a 4-bit number. For example, here we display a letter A. 0110 1001 1111 ← 1001 1001 a) b) Give the hexadecimal digits to display the letter C. (Since you choose the "font", show your work!) What letter is displayed by entering F22AE (leftmost digit is top row)? Suppose we create a computer screen out of black/white pixels. Each row of the screen is controlled by a 4-bit number. For example, here we display a letter A. 0110 1001 1111 ← 1001 1001 a) b) Give the hexadecimal digits to display the letter C. (Since you choose the "font", show your work!) What letter is displayed by entering F22AE (leftmost digit is top row)?

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